Who was the first president to travel outside of the U.S. while in office?

The first president to travel outside of the U.S. while in office was Theodore Roosevelt. His notable journey took place in 1906 when he visited Panama to inspect the construction of the Panama Canal. This trip marked a significant moment in presidential history, as it was uncommon for a sitting president to leave the country at that time, highlighting Roosevelt's progressive leadership and willingness to engage with international affairs. His visit underscored the importance of the Panama Canal as a strategic asset for U.S. maritime interests and showcased Roosevelt’s commitment to expanding American influence both domestically and abroad. This decision set a precedent for future presidents, illustrating a shift in how the role of the presidency could involve active participation on the global stage.